Research on the efficient EM modeling method from multilayered anisotropic medium-metal composite targets

Abstract

The paper presents a high-frequency modeling approach tailored for the electromagnetic (EM) scattering characteristics from electrically large radar targets coated with multi-layered anisotropic mediums (MLAMs). The approach begins by deriving the plane-wave spectrum expression for the incident EM field within MLAMs. It then employs spectral domain full-wave analysis method (SDFWAM) to obtain an analytical representation of the scattering field, further leveraging saddle point evaluation (SPE) to derive asymptotic solutions in the spatial domain. By integrating principles of physical optics (PO) and the tangent plane approximation, the far-field scattering characteristics of target enveloped in the specified medium are efficiently delineated. Validations against standard structure and the Misty satellite model reveal the method's pronounced alignment with the method of moments – finite element method (MoM-FEM) hybrid numerical algorithm, underscoring its notable computational efficiency. Furthermore, in conjunction with scattering sources decomposition technique, the approach is applied to optimize the radar cross-section (RCS) of the Su-57 aircraft, achieving precise and intelligent RCS control at minimal material cost. In conclusion, this research offers pivotal technological and theoretical foundations for EM scattering prediction, stealth design, and performance assessment in radar target domains.

Efficient and Rapid Modeling of Radar Echo Responses for Complex Targets under Arbitrary Wideband Excitation

“…Moreover, inverse imaging algorithms for SAR based on time-domain stepped-frequency radar methods were introduced [8][9][10][11]; these involved replacing linear frequency-modulated pulse excitation with Gaussian pulses, demodulating scattering echo data, compressing pulses, and performing the azimuth inverse fast Fourier transform (IFFT) to obtain radar wideband echo signals. Additionally, a range of efficient EM scattering domain PO modeling methods were proposed for single/multi-layer anisotropic medium-coated metal conductor targets [12][13][14][15][16][17].…”

“…Secondly, although there have been advancements in target EM scattering simulation algorithms, they are limited to providing simulation data and do not meet the demand for various parts of scattering data and the underlying "information" required for target recognition [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. Unfortunately, these critical pieces of information are often lost during the synthesis process, making it extremely challenging to extract target scattering characteristic information, particularly when dealing with the complex requirements of precise radar target recognition systems.…”